Nat,
You can create an “ObjectDB” User Library with the required jars and select the User Library as JPA Implementation Type in the wizard for adding JPA Facet (select “Generic 2.1” as Platform).
A connection is required to use the generation facilities. Since there is no JDBC driver available for ObjectDB currently, you can ignore setting up the connection in the wizard.Please note that you will not be able to use some of the JPA facilities as the connection is not set.
Hope this helps.
Let us know if you need further assistance.